Pencil-sharpener.



D. P. OLIVER.

PENCIL SHARPENER.

APPLICATION FILED OCT 25, 1909 9?9,688, Patented Dec. 27, 1910.

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erases.

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- DOCTOR FRANKLIN OLIVER, OF FRUITVALE, CALIFORNIA.

PENCIL SHARPENEB.

Specification of Letters Patent.

Application filed October 25, 1909. Serial No. 524,541;

To all whom it may] concern:

Be it .known that I, Doc'ron FRANKLIN OLIVER, a citizen of the United States, re-

siding at Fruitvale, in the county of Alamedaand State of California, have invented certain new. and useful Improvements in Pencil-Sharpeners, of which the following is a specification.

The hereinafter described invention relates to that type of pencil sharpeners 'known as rotary cutters, 6. whereinthe cutting blades are given a rotary movement during the inward feed of the pencil. Usually, with this class of sharpeners, the pencil is held by a single bearing andthe entire surface of the pencil, insertedwithin the sharpener is acted on by. the cutting blade or blades, the result being that the slightest vibration of the pencil causes the lead being sharpened to break.

The object of the presentinvention. is to provide a series of step bearings for the should be had to the accompanying sheetof drawings, wherein Figure l is a verti improved sharpener disclosing the position of the cutting blade, thepencil within the barrel for the cutting blade, and-illustrating the-character of the cut given to the end of the pencil sharpened. Fig. 2 is a plan view of the barrel carrying the cutting blades, the outer cylindrical casing for the barrel being sectioned. Fig. 3 is an endelevation of the sharpener and the holder for the pencil. Fig. l is a detail View of the cutter removed from its barrel.

lnthe drawings, the numeral 1 is used to indicate any suitable form of a supporting base, on which is rotatably mounted the drive gear 2. This gear meshes with a pinion 3, the shaft 4 of which works within the bearing 4 of the supporting base.

Tihe conical barrel 5 is inwardly tapered toward the outwardly projected foot extension 6, and the said barrel is centrally slotted from its inner enclto within a short distance of its outer enlarged end. teriorly is formed with a series of step bearcal sectional view of the This barrel in-- ings 7, which, due to the taper of the barrel, gradually reduce in diameter toward the in ner end.

Within the slotted portion of the barrel 5 is fitted the cutter, which, in the present case, comprises a single piece of metal stamped to form a V-shaped cutting blade, the inner face of each cutting member 8 being formed witha series of inclined step cutting edges 8, and straight bearing surfaces 9. These bearing surfaces register with the bearings 7 of the barrel 5 and the cutting edges 8 project a slight distance inwardly beyond the inclined faces 9 of the barrel, when the cutting blade is fitted there-- in. The cutting blade is-provided with a foot extension 9 'which corresponds in shape to that of the'bar-reL-and from said exten sion projects the flat projection 10, which rests within the slotted screw-threaded stud 11 projecting from the foot extension 6 of the barrel, the edges of the projection 10 having threads thereon which correspond with those out in the stud 11.

In assembling the sharpener, the fiat cutting blade, which is formed of thin metal, is inserted within the slotted portion of the barrel 5, and the projecting stud 11, of which the projection 10 forms a portion, is then screwed into the screw-threaded socket 12 of the shaft 4 of the pinion 3, to tightlyclamp the cutting blade in its adjusted position, after which the cylindrical casin 13 is fitted over the barrel to form a cham er 14 for receiving the shavings discharged through the outlet openings 15 of the said barrel.

From the supporting base 1 is extended a bracket 18, which, at its. outer end terminates in the split spring holder 17 for the penoil 18. v

In sharpening a pencil, rotation being im- Patented Dec. 27, 1910.

parted to the barrel and its connected parts by the drive gear 2 actuating the pinion 3,

the pencil 18 is inserted within the spring clamp holder 17 and gradually moved within the sharpener. The surface of'the pencil is engaged by the first of the series of the cutting edges 8', and successively by the reinaining ones as the pencil is fed inwardly, the lead of the pencil being finally acted on by the tapering cutting edges 18 of the blade. to give a point thereto. During same is held in position by the concentric bearing sections 7 which gradually reduce the travel of the pencil within the barrel 5, the

in diameter, and the pencil thus secured against lateral movement. A

By the construction of the sharpener, the cutting blade acts onto the pencil in the same manner as a series of graduated planers, so that when the shar ned pencil 1s removed from within the s arpener, the end thereof will present the appearance of a series of concentric ridges.

Having thus described the invention what is claimed as new and desired to be protected by Letters Patent is 1. In a ncil sharpener, the combination with a suitable base, of a barrel rotatably mounted thereon, a series of concentric step bearings within the same, a cutting blade held within the-barrel, the said blade being provided with a series of step cutting edges which project within the barrel intermedi-. ate the step bearings thereof.

2. In a ncil sharpener, the combination with a sultable base, of a barrel rotatably mounted thereon, a series of concentric step bearings within the. barrel, and a series of inclined cutting edges within the barrel intermediate the step bearings thereof.

3. Apencil sharpener, the same comprising a tapering barrel for the cutting blade, the said barrel being provided on its inner surface with a series of concentric step bearings, find alcutting blade removably held with the arre 4. A pencil sharpener, the same com ris-' ing a ta erin barrel for the cutting b ade, the said barre being centrally slotted to receive a cutting blade, and provided on its inner face with a series of concentric step bearings, and a cutting blade held within means for holding the cutting blade within the barrel.

6. A pencil sharpener comprising a cutbearings for said blade, the cutting surfaces of the blade extended beyond the bearing surfaces of the holder.

7. In a pencil sharpener, the combination with a holder provided with a plurality of step bearings, a cutting blade comprising two cutting members formed from a single piece of metal held within the holder, the inner edge of each cutting member having a series of step cutting surfaces which pro ect beyond the bearing surfaces of the holder and act successively against the surface of a pencil during the operation of sharpening.

8. A pencil sharpener, the same comprising a barrel provided on its inner face with a series of step bearings, ablade formed with a series of step cutting edges held within the barrel, means for imparting rotation to the barrel, and a spring clamp guide holder for the pencil to be sharpened.

9. In a pencil sharpener, a barrel for the cutting blade, and the said barrel on its inner face being provided with a plurality of step bearings. I

10. In a pencil sharpener, thecombination with a barrel provided on its inner face with a plurality of step bearings, a blade formed with a series of step cutting edges'held within the barrel, and an outer casing for the blade holding barrel, the said casing form-' ing a chamber to receive the cuttings discharged from the barrel.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

Witnesses:

N. A. AGKEB, D. B. RICHARDS. 

